October 2017
Intermediate to advanced
340 pages
9h 46m
English
Content preview from Learning Ceph - Second Edition
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PG peering
Client write and read requests issued against RADOS objects from a client are sent to the PG to which the object belongs before being persisted to OSDs. If the replication factor (denoted by the size attribute) of the pool is greater than 1, then writes must be persisted on multiple OSDs. For example, if the size of a pool is 3, then we have three copies of each Object present in the pool spread across 3 disjoint OSDs. Any write issued by a client however must to be completed on all three OSDs before the client gets an acknowledgement. Every PG denotes one OSD designated as the primary (or lead) OSD. All additional OSDs that hold a given PG are known as secondary OSDs within the context of that PG. The primary OSD is responsible ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.